I am familiar with several south asian and european languages. Bengali,
my mother tongue, was the only language I spoke with any confidence, till
I was 22. Over years I learned to speak English spiced with strong
Bengali accent, Hindi made politically correct by gender-insensitive
conjugation, French denuded of sujonctif and other monstrosities, and finally
Kannada, which only my wife follows.

I have tried to learn Mandarin and unleash it on unsuspecting Chinese.
Given the unfortunate results, I let go the idea.